Firstly, I never used Roberdeau's map for anything to do with this thread. There's no need, any angles can be estimated using the relative position of the limo.
Secondly, nowhere have I said "no-one knows Nix's position". It doesn't take too much brainpower to figure out where Nix is standing but, again, it's not necessary to know where he's standing in Dealey Plaza.
Thirdly, the position Roberdeau has for Nix on his map is more or less accurate, not that it matters.
Other than that, great contribution 
Gee. You seemed to have changed your " location of Nix" answer since this post.
First, it's a matter of " not much brainpower", and Roberdeau's map is " more or less accurate.
Now, it's " I have no idea."
Your previous - since corrected - " contribution is duly noted.
